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Finding the Fourth Proportional to 990.62, 1,348.72 and 987.54

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Solution

The fourth proportional to 990.62, 1,348.72 and 987.54 is: 1,344.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.62 : 1,348.72 = 987.54 : x
  2. Step 2: Convert to fraction form
    990.62/1,348.72 = 987.54/x
  3. Step 3: Cross multiply
    990.62x = 1,348.72 × 987.54
  4. Step 4: Simplify right side
    990.62x = 1,331,914.95
  5. Step 5: Solve for x
    x = 1,331,914.95/990.62
  6. Step 6: Final answer
    x = 1,344.53

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.